Crossword Genius

Butterfly, one passing over (7)

Ross

I believe the answer is:

skipper

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This clue might be a double definition.

'butterfly' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'one passing over' is the second definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

Can you help me to learn more?

(Other definitions for skipper that I've seen before include "one that's put over the side" , "sleep in outhouse" , "One who misses" , "sea-captain" , "Shakespeare's giddy youth" .)

I've seen this clue in The Times.
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